*,::before,::after{
  margin: 0;
  padding: 0;
  -webkit-tap-highlight-color: transparent; /*清楚webkit浏览器点击高亮效果*/
  box-sizing: border-box;
  -webkit-box-sizing: border-box; /*以你的border开始计算你的宽度*/
}

body{
  font-size: 14px;
  font-family: "Microsoft YaHei",sans-serif;/*第二个是手机的一个默认的字体*/
  color: #333;
}
a{
  text-decoration: none;
  color: #000;
}

ul{
  list-style: none;
}

input,textarea{
  border: none;
  resize: none;
  outline: none;/*清除选中效果*/
  -webkit-appearance: none;/*清楚浏览器默认的样式*/
}

/*清除浮动*/
.clearfix::before,
.clearfix::after{
  content: ".";
  display: block;
  height: 0;
  line-height: 0;
  visibility: hidden;
  clear: both;
}

[class^="icon_"]{
  background: url("../images/sprites.png") no-repeat;
  background-size: 200px 200px;
}

/*头部的样式*/
.jd_topBar{
  width: 100%;
  height: 45px;
  background: url("../images/header-bg.png") repeat-x;
  background-size: 1px 44px;
  border-bottom: 1px solid #e0e0e0;
  position: absolute;
  z-index: 1;
  /*返回按钮*/
  .icon_back{
    background-position: -20px 0;
    width: 20px;
    height: 20px;
    display: block;
    margin: 12px 10px;
    position: absolute;
    top: 0;
    left: 0;
  }
  form{
    width: 100%;
    height: 44px;
    padding: 0 40px;
    input{
      width: 100%;
      height: 32px;
      border: 1px solid #bfbfbf;
      margin-top: 6px;
      border-radius: 4px;
    }
  }
  h2{
    text-align: center;
    font-size: 16px;
    font-family: sans-serif;
    font-weight: inherit;
    line-height: 44px;
  }
  .icon_menu{
    background-position: -60px 0;
    width: 40px;
    height: 44px;
    display: block;
    padding: 12px 10px;
    background-clip: content-box;
    background-origin: content-box;
    position: absolute;
    top: 0;
    right: 0;
  }
}